Вычислите используя законы умножения а) 48*5/17+48*12/17, б) 55*7/11-55*6/11, в) 11/13*11/15+11/13*2/15, г) 12/19*23/15-12/19*4/15, д) 22/21*5/14+20/21*5/14, е) 47/11*1/2-25/11*1/2

А) 48 * (5/17+1217) = 48*17/17=48*1=48

б) 55 * (7/11-6/11) = 55*1/11=55/11=5

в) 11/13 * (11/15+2/15) = 11/13*13/15=11/15

г) 12/19 * (23/15-4/15) = 12/19*19/15=4/5

д) 5/14 * (22/21+20/21) = 5/14*42/21=15/21

е) 1/2 * (47/11-25/11) = 1/2*22/11=11/11=1

1) 48 * 5/17 + 48 * 12/17 = 48 * (5/17 + 12/17) = 48 * 17/17 = 48 * 1 = 48.

2) 55 * 7/11 - 55 * 6/11 = 55 * (7/11 - 6/11) = 55 * 1/11 = 55/11 = 5.

3) 11/13 * 11/15 + 11/13 * 2/15 = 11/13 * (11/15 + 2/15) = 11/13 * 13/15 = 11/15.

4) 12/19 * 23/15 - 12/19 * 4/15 = 12/19 * (23/15 - 4/15) = 12/19 * 19/14 = 12/14 = 6/7.

5) 22/21 * 5/14 + 2O/21 * 5/14 = 5/14 * (22/21 + 2O/21) = 5/14 * 42/21 = 5/14 * 2 = (5 * 2) / 14 = 5/7.

6) 47/11 * 1/2 - 25/11 * 1/2 = 1/2 * (47/11 - 25/11) = 1/2 * 22/11 = 1.